Date: Thu, 25 May 2006 18:03:40 +0300 From: Andriy Gapon <avg@icyb.net.ua> To: freebsd-acpi@freebsd.org Cc: Nate Lawson <web@root.org> Subject: nforce2 cpufreq Message-ID: <4475C74C.2080204@icyb.net.ua>
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I've recently had a sudden urge to investigate power saving / cpu throttling options for my desktop Athlon XP system. It seems that the CPU itself does not provide any interfaces for that, at least neither of acpi_perf/acpi_throttle/cpufreq seem to detect anything interesting for them. Or am I mistaken and doing something wrong ? Anyway, my MB is based on nForce2 chipset and I found out that Linux has cpufreq-nforce2 module that works in their cpufreq framework: http://www.hasw.net/linux/ It seems that that module works by using nForce2 PCI interface for querying and changing FSB frequency. It also seems that the code is rather simple and obvious in its logic (save for allegedly reverse-engineered constants). Not sure though how easy it is to port that to FreeBSD cpufreq framework. But the question that I really would like to ask is the following: is it a proper way to do cpufreq stuff by changing FSB frequency ? Would that approach fit into our framework ? And finally, would it have any positive temperature/power consumption effects ? -- Andriy Gapon
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